This record as markdown: /tools/io-github-kivanccakmak-yaver/qr-code.md
What qr_code does on Yaver
AI agents call qr_code to retrieve information from Yaver without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
text | string | Yes | Text to encode |
Parameters from the server's own tool schema.
Why qr_code is rated Low
This tool performs a stateless encoding operation. It takes text as input and produces a QR code output (likely an image or data structure). There is no retrieval of sensitive data, no modification of state, no code execution, no deletion, and no financial transaction. The operation is idempotent and reversible.
From the tool's definition 'Generate a QR code from text' — a pure transformation of input text into a visual code format with no side effects, data persistence, or external system modification.
Attacks that exploit this kind of access
The rule that runs qr_code safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Yaver, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For qr_code, this is the rule to start with:
qr_code is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Yaver, apply this rule, and every qr_code call is checked against it from then on.
Questions about qr_code
Generate a QR code from text. It is categorised as a Read tool in the Yaver MCP Server, which means it retrieves data without modifying state.
qr_code accepts 1 parameter: text. Required: text. The full parameter table on this page comes from the server's own tool schema.
Register the Yaver MCP server in PolicyLayer and add a rule for qr_code: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Yaver. Nothing to install.
qr_code is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the qr_code rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for qr_code. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
qr_code is provided by the Yaver MCP server (yaver-cli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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